IP Library › Granted Patent US 12,227,466
Granted Patent B2
US 12,227,466 · App. 17/898,715 · Granted Feb 18, 2025

Methods and systems for performing oxidative coupling of methane

Inventors: Gary Podrebarac (Friendswood, TX); Zan Liu (Katy, TX); Khalid Azzam (Sugarland, TX); Daniel Rosenberg (Dunaujvaros, HU)
Assignee: Lummus Technology LLC
C07C2/84C07C2523/26C07C2523/42C07C2523/72
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Quick Facts
Patent No.
US 12,227,466
App. No.
17/898,715
Granted
Feb 18, 2025
Kind
B2
Abstract

A method of performing an oxidative coupling of methane (OCM) reaction to produce C 2+ compounds using a low temperature gas mixture feed is provided. The method includes introducing a gas mixture feed containing methane, oxygen, hydrogen, and carbon monoxide at a temperature of less than or equal to 300° C. to an inlet of an OCM reactor, which contains a combustion catalyst and an OCM catalyst. At least a portion of the gas mixture feed is combusted using the combustion catalyst to generate a heated gas mixture having a temperature of at least 450° C. The heated gas mixture contacts the OCM catalyst to initiate an OCM reaction and produce an OCM effluent that includes C 2+ compounds. A system for performing an OCM reaction using a low temperature feedstock gas mixture is also provided.

Claims (34)

1. A method of performing an oxidative coupling of methane (OCM) reaction to produce C 2+ compounds, the method comprising:

(a) introducing a gas mixture feed comprising methane (CH 4 ), oxygen (O 2 ), hydrogen (H 2 ), and carbon monoxide (CO) and having a temperature of less than or equal to 300° C. to an inlet of an OCM reactor, wherein the OCM reactor comprises a combustion catalyst and an OCM catalyst;

(b) contacting the combustion catalyst with the gas mixture feed to combust at least a portion of the gas mixture feed and generate a heated gas mixture having a temperature of at least 450° C.; and

(c) contacting the OCM catalyst with the heated gas mixture to initiate an OCM reaction and produce an OCM effluent comprising (i) C 2+ compounds including ethylene and ethane, and (ii) non-C 2+ impurities comprising one or more of CO, CH 4 , H 2 , and carbon dioxide (CO 2 ).

2. The method of claim 1 , wherein the combustion catalyst comprises a metal, a metal oxide, or a mixed metal oxide, wherein the metal, the metal oxide, or the mixed metal oxide comprises at least one of platinum, chromium, copper, palladium, cobalt, iron, manganese, gold, cerium, bismuth, indium, molybdenum, rhodium, ruthenium, germanium, gadolinium, antimony, thallium, tellurium, lead, zinc, or tin.

3. The method of claim 1 , wherein the gas mixture feed has a temperature of 15° C. to 250° C. at the inlet of the OCM reactor.

4. The method of claim 1 , wherein the OCM reactor further comprises at least one ignition source, wherein the at least one ignition source promotes ignition of components of the gas mixture feed.

5. The method of claim 4 , wherein the at least one ignition source is in contact with the combustion catalyst and comprises at least one of an electrically powered cartridge heater or a steam heated pipe.

6. The method of claim 4 , wherein the at least one ignition source is positioned upstream of both the combustion catalyst and the OCM catalyst and comprises an injection of superheated steam at a temperature of 600° C. to 1,000° C.

7. The method of claim 1 , wherein the OCM reaction has a selectivity for C 2+ compounds of at least 35%.

8. The method of claim 1 , wherein the combustion catalyst preferentially combusts H 2 , CO, or both over CH 4 .

9. A method of performing an oxidative coupling of methane (OCM) reaction to produce C 2+ compounds, the method comprising:

(a) mixing an oxidant stream comprising oxygen (O 2 ) having a temperature of 0° C. to 50° C. with a hydrocarbon stream comprising methane (CH 4 ), carbon monoxide (CO), and hydrogen (H 2 ) having a temperature of less than or equal to 300° C. to form a gas mixture feed having a temperature of less than or equal to 300° C.;

(b) introducing the gas mixture feed to an inlet of an OCM reactor, wherein the OCM reactor comprises a combustion catalyst and an OCM catalyst;

(c) contacting the combustion catalyst with the gas mixture feed to combust at least a portion of gas mixture feed and generate a heated gas mixture having a temperature of at least 450° C.; and

(d) contacting the OCM catalyst with the heated gas mixture to initiate an OCM reaction and produce an OCM effluent comprising (i) C 2+ compounds including ethylene and ethane, and (ii) non-C 2+ impurities comprising one or more of CO, CH 4 , H 2 , and carbon dioxide (CO 2 ).

10. The method of claim 9 , wherein the oxidant stream further comprises steam.

11. The method of claim 9 , wherein the combustion catalyst comprises a metal, a metal oxide, or a mixed metal oxide, wherein the metal, the metal oxide, or the mixed metal oxide comprises at least one of platinum, chromium, copper, palladium, cobalt, iron, manganese, gold, cerium, bismuth, indium, molybdenum, rhodium, ruthenium, germanium, gadolinium, antimony, thallium, tellurium, lead, zinc, or tin.

12. The method of claim 9 , wherein the gas mixture feed has a temperature of 15° C. to 250° C. at the inlet of the OCM reactor.

13. The method of claim 9 , wherein the OCM reactor further comprises at least one ignition source, wherein the at least one ignition source promotes ignition of components of the gas mixture feed.

14. The method of claim 13 , wherein the at least one ignition source is in contact with the combustion catalyst and comprises at least one of an electrically powered cartridge heater or a steam heated pipe.

15. The method of claim 13 , wherein the at least one ignition source is positioned upstream of both the combustion catalyst and the OCM catalyst and comprises an injection of superheated steam at a temperature of 600° C. to 1,000° C.

16. The method of claim 9 , wherein the OCM reaction has a selectivity for C 2+ compounds of at least 35%.

17. The method of claim 9 , wherein the combustion catalyst preferentially combusts H 2 , CO, or both over CH 4 .

18. A system for performing an oxidative coupling of methane (OCM) reaction to produce C 2+ compounds, the system comprising:

an OCM reactor comprising a combustion catalyst and an OCM catalyst,

wherein the OCM reactor receives a gas mixture feed comprising methane (CH 4 ), oxygen (O 2 ), hydrogen (H 2 ), and carbon monoxide (CO) at a temperature of less than or equal to 300° C.,

wherein the combustion catalyst promotes combustion of at least a portion of the gas mixture feed to generate a heated gas mixture having a temperature of at least 450° C., and

wherein the OCM catalyst initiates an OCM reaction when contacted by the heated gas mixture and produces an OCM effluent comprising (i) C 2+ compounds including ethylene and ethane, and (ii) non-C 2+ impurities comprising one or more of CO, CH 4 , H 2 , and carbon dioxide (CO 2 ).

19. The system of claim 18 , wherein the combustion catalyst comprises a metal, a metal oxide, or a mixed metal oxide, wherein the metal, the metal oxide, or the mixed metal oxide comprises at least one of platinum, chromium, copper, palladium, cobalt, iron, manganese, gold, cerium, bismuth, indium, molybdenum, rhodium, ruthenium, germanium, gadolinium, antimony, thallium, tellurium, lead, zinc, or tin.

20. The system of claim 18 , wherein the OCM reactor further comprises at least one ignition source, wherein the at least one ignition source promotes ignition of components of the gas mixture feed.

21. The system of claim 20 , wherein the at least one ignition source is in contact with the combustion catalyst and comprises at least one of an electrically powered cartridge heater or a steam heated pipe.

22. The system of claim 20 , wherein the at least one ignition source is positioned upstream of both the combustion catalyst and the OCM catalyst and comprises a superheated steam injector that injects steam at a temperature of 600° C. to 1,000° C. into the OCM reactor.

23. The system of claim 18 , wherein the combustion catalyst preferentially combusts H 2 , CO, or both over CH 4 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 27, 2022
From: PODREBARAC, GARY; LIU, ZAN; AZZAM, KHALID; ROSENBERG, DANIEL
To: LUMMUS TECHNOLOGY LLC
Reel/Frame 061556/0796 →
Continuity (2)
Provisional Application 63238816 · Aug 31, 2021
Related Publication 20230061675A1 · Mar 2, 2023
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